/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.actuate.metrics.buffer;

/**
 * Base class for a mutable buffer containing a timestamp and a value.
 *
 * @param <T> the value type
 * @author Dave Syer
 * @author Phillip Webb
 */
abstract class Buffer<T extends Number> {

	private volatile long timestamp;

	Buffer(long timestamp) {
		this.timestamp = timestamp;
	}

	public long getTimestamp() {
		return this.timestamp;
	}

	public void setTimestamp(long timestamp) {
		this.timestamp = timestamp;
	}

	/**
	 * Returns the buffer value.
	 * @return the value of the buffer
	 */
	public abstract T getValue();

}
